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<a class="jxr_linenumber" name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="2" href="#2">2</a>   <em class="jxr_comment"> * Copyright 2012 The Netty Project</em>
<a class="jxr_linenumber" name="3" href="#3">3</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="4" href="#4">4</a>   <em class="jxr_comment"> * The Netty Project licenses this file to you under the Apache License,</em>
<a class="jxr_linenumber" name="5" href="#5">5</a>   <em class="jxr_comment"> * version 2.0 (the "License"); you may not use this file except in compliance</em>
<a class="jxr_linenumber" name="6" href="#6">6</a>   <em class="jxr_comment"> * with the License. You may obtain a copy of the License at:</em>
<a class="jxr_linenumber" name="7" href="#7">7</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="8" href="#8">8</a>   <em class="jxr_comment"> *   <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a class="jxr_linenumber" name="9" href="#9">9</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="10" href="#10">10</a>  <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a class="jxr_linenumber" name="11" href="#11">11</a>  <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT</em>
<a class="jxr_linenumber" name="12" href="#12">12</a>  <em class="jxr_comment"> * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the</em>
<a class="jxr_linenumber" name="13" href="#13">13</a>  <em class="jxr_comment"> * License for the specific language governing permissions and limitations</em>
<a class="jxr_linenumber" name="14" href="#14">14</a>  <em class="jxr_comment"> * under the License.</em>
<a class="jxr_linenumber" name="15" href="#15">15</a>  <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="16" href="#16">16</a>  <strong class="jxr_keyword">package</strong> org.jboss.netty.handler.ipfilter;
<a class="jxr_linenumber" name="17" href="#17">17</a>  
<a class="jxr_linenumber" name="18" href="#18">18</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.logging.InternalLogger;
<a class="jxr_linenumber" name="19" href="#19">19</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.logging.InternalLoggerFactory;
<a class="jxr_linenumber" name="20" href="#20">20</a>  
<a class="jxr_linenumber" name="21" href="#21">21</a>  <strong class="jxr_keyword">import</strong> java.math.BigInteger;
<a class="jxr_linenumber" name="22" href="#22">22</a>  <strong class="jxr_keyword">import</strong> java.net.Inet4Address;
<a class="jxr_linenumber" name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> java.net.Inet6Address;
<a class="jxr_linenumber" name="24" href="#24">24</a>  <strong class="jxr_keyword">import</strong> java.net.InetAddress;
<a class="jxr_linenumber" name="25" href="#25">25</a>  <strong class="jxr_keyword">import</strong> java.net.UnknownHostException;
<a class="jxr_linenumber" name="26" href="#26">26</a>  
<a class="jxr_linenumber" name="27" href="#27">27</a>  <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="28" href="#28">28</a>  <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="29" href="#29">29</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> CIDR6 <strong class="jxr_keyword">extends</strong> <a href="../../../../../org/jboss/netty/handler/ipfilter/CIDR.html">CIDR</a> {
<a class="jxr_linenumber" name="30" href="#30">30</a>  
<a class="jxr_linenumber" name="31" href="#31">31</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../../org/jboss/netty/logging/InternalLogger.html">InternalLogger</a> logger = InternalLoggerFactory.getInstance(CIDR6.<strong class="jxr_keyword">class</strong>);
<a class="jxr_linenumber" name="32" href="#32">32</a>  
<a class="jxr_linenumber" name="33" href="#33">33</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The big integer for the base address */</em>
<a class="jxr_linenumber" name="34" href="#34">34</a>      <strong class="jxr_keyword">private</strong> BigInteger addressBigInt;
<a class="jxr_linenumber" name="35" href="#35">35</a>  
<a class="jxr_linenumber" name="36" href="#36">36</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The big integer for the end address */</em>
<a class="jxr_linenumber" name="37" href="#37">37</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> BigInteger addressEndBigInt;
<a class="jxr_linenumber" name="38" href="#38">38</a>  
<a class="jxr_linenumber" name="39" href="#39">39</a>      <strong class="jxr_keyword">protected</strong> CIDR6(Inet6Address newaddress, <strong class="jxr_keyword">int</strong> newmask) {
<a class="jxr_linenumber" name="40" href="#40">40</a>          cidrMask = newmask;
<a class="jxr_linenumber" name="41" href="#41">41</a>          addressBigInt = ipv6AddressToBigInteger(newaddress);
<a class="jxr_linenumber" name="42" href="#42">42</a>          BigInteger mask = ipv6CidrMaskToMask(newmask);
<a class="jxr_linenumber" name="43" href="#43">43</a>          <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="44" href="#44">44</a>              addressBigInt = addressBigInt.and(mask);
<a class="jxr_linenumber" name="45" href="#45">45</a>              baseAddress = bigIntToIPv6Address(addressBigInt);
<a class="jxr_linenumber" name="46" href="#46">46</a>          } <strong class="jxr_keyword">catch</strong> (UnknownHostException e) {
<a class="jxr_linenumber" name="47" href="#47">47</a>              <em class="jxr_comment">// this should never happen.</em>
<a class="jxr_linenumber" name="48" href="#48">48</a>          }
<a class="jxr_linenumber" name="49" href="#49">49</a>          addressEndBigInt = addressBigInt.add(ipv6CidrMaskToBaseAddress(cidrMask)).subtract(BigInteger.ONE);
<a class="jxr_linenumber" name="50" href="#50">50</a>      }
<a class="jxr_linenumber" name="51" href="#51">51</a>  
<a class="jxr_linenumber" name="52" href="#52">52</a>      @Override
<a class="jxr_linenumber" name="53" href="#53">53</a>      <strong class="jxr_keyword">public</strong> InetAddress getEndAddress() {
<a class="jxr_linenumber" name="54" href="#54">54</a>          <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="55" href="#55">55</a>              <strong class="jxr_keyword">return</strong> bigIntToIPv6Address(addressEndBigInt);
<a class="jxr_linenumber" name="56" href="#56">56</a>          } <strong class="jxr_keyword">catch</strong> (UnknownHostException e) {
<a class="jxr_linenumber" name="57" href="#57">57</a>              <strong class="jxr_keyword">if</strong> (logger.isErrorEnabled()) {
<a class="jxr_linenumber" name="58" href="#58">58</a>                  logger.error(<span class="jxr_string">"invalid ip address calculated as an end address"</span>);
<a class="jxr_linenumber" name="59" href="#59">59</a>              }
<a class="jxr_linenumber" name="60" href="#60">60</a>              <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="61" href="#61">61</a>          }
<a class="jxr_linenumber" name="62" href="#62">62</a>      }
<a class="jxr_linenumber" name="63" href="#63">63</a>  
<a class="jxr_linenumber" name="64" href="#64">64</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">int</strong> compareTo(<a href="../../../../../org/jboss/netty/handler/ipfilter/CIDR.html">CIDR</a> arg) {
<a class="jxr_linenumber" name="65" href="#65">65</a>          <strong class="jxr_keyword">if</strong> (arg instanceof CIDR4) {
<a class="jxr_linenumber" name="66" href="#66">66</a>              BigInteger net = ipv6AddressToBigInteger(arg.baseAddress);
<a class="jxr_linenumber" name="67" href="#67">67</a>              <strong class="jxr_keyword">int</strong> res = net.compareTo(addressBigInt);
<a class="jxr_linenumber" name="68" href="#68">68</a>              <strong class="jxr_keyword">if</strong> (res == 0) {
<a class="jxr_linenumber" name="69" href="#69">69</a>                  <strong class="jxr_keyword">if</strong> (arg.cidrMask == cidrMask) {
<a class="jxr_linenumber" name="70" href="#70">70</a>                      <strong class="jxr_keyword">return</strong> 0;
<a class="jxr_linenumber" name="71" href="#71">71</a>                  }
<a class="jxr_linenumber" name="72" href="#72">72</a>                  <strong class="jxr_keyword">if</strong> (arg.cidrMask &lt; cidrMask) {
<a class="jxr_linenumber" name="73" href="#73">73</a>                      <strong class="jxr_keyword">return</strong> -1;
<a class="jxr_linenumber" name="74" href="#74">74</a>                  }
<a class="jxr_linenumber" name="75" href="#75">75</a>                  <strong class="jxr_keyword">return</strong> 1;
<a class="jxr_linenumber" name="76" href="#76">76</a>              }
<a class="jxr_linenumber" name="77" href="#77">77</a>              <strong class="jxr_keyword">return</strong> res;
<a class="jxr_linenumber" name="78" href="#78">78</a>          }
<a class="jxr_linenumber" name="79" href="#79">79</a>          CIDR6 o = (CIDR6) arg;
<a class="jxr_linenumber" name="80" href="#80">80</a>          <strong class="jxr_keyword">if</strong> (o.addressBigInt.equals(addressBigInt) &amp;&amp; o.cidrMask == cidrMask) {
<a class="jxr_linenumber" name="81" href="#81">81</a>              <strong class="jxr_keyword">return</strong> 0;
<a class="jxr_linenumber" name="82" href="#82">82</a>          }
<a class="jxr_linenumber" name="83" href="#83">83</a>          <strong class="jxr_keyword">int</strong> res = o.addressBigInt.compareTo(addressBigInt);
<a class="jxr_linenumber" name="84" href="#84">84</a>          <strong class="jxr_keyword">if</strong> (res == 0) {
<a class="jxr_linenumber" name="85" href="#85">85</a>              <strong class="jxr_keyword">if</strong> (o.cidrMask &lt; cidrMask) {
<a class="jxr_linenumber" name="86" href="#86">86</a>                  <em class="jxr_comment">// greater Mask means less IpAddresses so -1</em>
<a class="jxr_linenumber" name="87" href="#87">87</a>                  <strong class="jxr_keyword">return</strong> -1;
<a class="jxr_linenumber" name="88" href="#88">88</a>              }
<a class="jxr_linenumber" name="89" href="#89">89</a>              <strong class="jxr_keyword">return</strong> 1;
<a class="jxr_linenumber" name="90" href="#90">90</a>          }
<a class="jxr_linenumber" name="91" href="#91">91</a>          <strong class="jxr_keyword">return</strong> res;
<a class="jxr_linenumber" name="92" href="#92">92</a>      }
<a class="jxr_linenumber" name="93" href="#93">93</a>  
<a class="jxr_linenumber" name="94" href="#94">94</a>      @Override
<a class="jxr_linenumber" name="95" href="#95">95</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> contains(InetAddress inetAddress) {
<a class="jxr_linenumber" name="96" href="#96">96</a>          BigInteger search = ipv6AddressToBigInteger(inetAddress);
<a class="jxr_linenumber" name="97" href="#97">97</a>          <strong class="jxr_keyword">return</strong> search.compareTo(addressBigInt) &gt;= 0 &amp;&amp; search.compareTo(addressEndBigInt) &lt;= 0;
<a class="jxr_linenumber" name="98" href="#98">98</a>      }
<a class="jxr_linenumber" name="99" href="#99">99</a>  
<a class="jxr_linenumber" name="100" href="#100">100</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="101" href="#101">101</a> <em class="jxr_javadoccomment">     * Given an IPv6 baseAddress length, return the block length.  I.e., a</em>
<a class="jxr_linenumber" name="102" href="#102">102</a> <em class="jxr_javadoccomment">     * baseAddress length of 96 will return 2**32.</em>
<a class="jxr_linenumber" name="103" href="#103">103</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="104" href="#104">104</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> BigInteger ipv6CidrMaskToBaseAddress(<strong class="jxr_keyword">int</strong> cidrMask) {
<a class="jxr_linenumber" name="105" href="#105">105</a>         <strong class="jxr_keyword">return</strong> BigInteger.ONE.shiftLeft(128 - cidrMask);
<a class="jxr_linenumber" name="106" href="#106">106</a>     }
<a class="jxr_linenumber" name="107" href="#107">107</a> 
<a class="jxr_linenumber" name="108" href="#108">108</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> BigInteger ipv6CidrMaskToMask(<strong class="jxr_keyword">int</strong> cidrMask) {
<a class="jxr_linenumber" name="109" href="#109">109</a>         <strong class="jxr_keyword">return</strong> BigInteger.ONE.shiftLeft(128 - cidrMask).subtract(BigInteger.ONE).not();
<a class="jxr_linenumber" name="110" href="#110">110</a>     }
<a class="jxr_linenumber" name="111" href="#111">111</a> 
<a class="jxr_linenumber" name="112" href="#112">112</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="113" href="#113">113</a> <em class="jxr_javadoccomment">     * Given an IPv6 address, convert it into a BigInteger.</em>
<a class="jxr_linenumber" name="114" href="#114">114</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="115" href="#115">115</a> <em class="jxr_javadoccomment">     * @return the integer representation of the InetAddress</em>
<a class="jxr_linenumber" name="116" href="#116">116</a> <em class="jxr_javadoccomment">     * @throws IllegalArgumentException if the address is not an IPv6</em>
<a class="jxr_linenumber" name="117" href="#117">117</a> <em class="jxr_javadoccomment">     *                                  address.</em>
<a class="jxr_linenumber" name="118" href="#118">118</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="119" href="#119">119</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> BigInteger ipv6AddressToBigInteger(InetAddress addr) {
<a class="jxr_linenumber" name="120" href="#120">120</a>         byte[] ipv6;
<a class="jxr_linenumber" name="121" href="#121">121</a>         <strong class="jxr_keyword">if</strong> (addr instanceof Inet4Address) {
<a class="jxr_linenumber" name="122" href="#122">122</a>             ipv6 = getIpV6FromIpV4((Inet4Address) addr);
<a class="jxr_linenumber" name="123" href="#123">123</a>         } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="124" href="#124">124</a>             ipv6 = addr.getAddress();
<a class="jxr_linenumber" name="125" href="#125">125</a>         }
<a class="jxr_linenumber" name="126" href="#126">126</a>         <strong class="jxr_keyword">if</strong> (ipv6[0] == -1) {
<a class="jxr_linenumber" name="127" href="#127">127</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> BigInteger(1, ipv6);
<a class="jxr_linenumber" name="128" href="#128">128</a>         }
<a class="jxr_linenumber" name="129" href="#129">129</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> BigInteger(ipv6);
<a class="jxr_linenumber" name="130" href="#130">130</a>     }
<a class="jxr_linenumber" name="131" href="#131">131</a> 
<a class="jxr_linenumber" name="132" href="#132">132</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="133" href="#133">133</a> <em class="jxr_javadoccomment">     * Convert a big integer into an IPv6 address.</em>
<a class="jxr_linenumber" name="134" href="#134">134</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="135" href="#135">135</a> <em class="jxr_javadoccomment">     * @return the inetAddress from the integer</em>
<a class="jxr_linenumber" name="136" href="#136">136</a> <em class="jxr_javadoccomment">     * @throws UnknownHostException if the big integer is too large,</em>
<a class="jxr_linenumber" name="137" href="#137">137</a> <em class="jxr_javadoccomment">     *                              and thus an invalid IPv6 address.</em>
<a class="jxr_linenumber" name="138" href="#138">138</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="139" href="#139">139</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> InetAddress bigIntToIPv6Address(BigInteger addr) <strong class="jxr_keyword">throws</strong> UnknownHostException {
<a class="jxr_linenumber" name="140" href="#140">140</a>         byte[] a = <strong class="jxr_keyword">new</strong> byte[16];
<a class="jxr_linenumber" name="141" href="#141">141</a>         byte[] b = addr.toByteArray();
<a class="jxr_linenumber" name="142" href="#142">142</a>         <strong class="jxr_keyword">if</strong> (b.length &gt; 16 &amp;&amp; !(b.length == 17 &amp;&amp; b[0] == 0)) {
<a class="jxr_linenumber" name="143" href="#143">143</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> UnknownHostException(<span class="jxr_string">"invalid IPv6 address (too big)"</span>);
<a class="jxr_linenumber" name="144" href="#144">144</a>         }
<a class="jxr_linenumber" name="145" href="#145">145</a>         <strong class="jxr_keyword">if</strong> (b.length == 16) {
<a class="jxr_linenumber" name="146" href="#146">146</a>             <strong class="jxr_keyword">return</strong> InetAddress.getByAddress(b);
<a class="jxr_linenumber" name="147" href="#147">147</a>         }
<a class="jxr_linenumber" name="148" href="#148">148</a>         <em class="jxr_comment">// handle the case where the IPv6 address starts with "FF".</em>
<a class="jxr_linenumber" name="149" href="#149">149</a>         <strong class="jxr_keyword">if</strong> (b.length == 17) {
<a class="jxr_linenumber" name="150" href="#150">150</a>             System.arraycopy(b, 1, a, 0, 16);
<a class="jxr_linenumber" name="151" href="#151">151</a>         } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="152" href="#152">152</a>             <em class="jxr_comment">// copy the address into a 16 byte array, zero-filled.</em>
<a class="jxr_linenumber" name="153" href="#153">153</a>             <strong class="jxr_keyword">int</strong> p = 16 - b.length;
<a class="jxr_linenumber" name="154" href="#154">154</a>             System.arraycopy(b, 0, a, p, b.length);
<a class="jxr_linenumber" name="155" href="#155">155</a>         }
<a class="jxr_linenumber" name="156" href="#156">156</a>         <strong class="jxr_keyword">return</strong> InetAddress.getByAddress(a);
<a class="jxr_linenumber" name="157" href="#157">157</a>     }
<a class="jxr_linenumber" name="158" href="#158">158</a> }
</pre>
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